JP2009202935A - Synthetic resin-made pallet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic resin-made pallet capable of improving the bending strength between girder parts by reducing the amount of use of a molding material of high bending strength, and increasing the impact-resistant strength of a deck part and an outer end part of the pallet. <P>SOLUTION: At least one connection rib 6 out of a plurality of the connection ribs 6 except a deck part 1 out of sites between girder parts 2 is formed of a first molding material 9 between the girder parts 2, and a part of cross ribs 7 are formed of the first molding material 9. An end part on the outer end part side of the pallet 4 at a part formed of the first molding material 9 is located at the position deviated inward of the outer end part of the pallet 4. The whole part of the deck part 1 of the pallet 4 and a part except a part formed of the first molding material other than the deck part 1 are formed of a second molding material 10. The first molding material 9 is higher in the bending strength than the second molding material 10. The wall thickness of the cross ribs 7 on the outer side of the plurality of connection ribs 6 is smaller than that of the connection ribs 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pallet made of synthetic resin having high bending strength.

  Conventionally, Patent Document 1 discloses that a portion connecting between beam portions that require the most strength (bending strength) in a synthetic resin pallet is formed of a molding material having high bending strength.

  In the conventional example shown in this Patent Document 1, a portion between the spar portions of the deck portion and a connecting rib that connects the spar portions on the back surface of the deck portion, and an intersection that intersects the connecting rib on the back surface of the deck portion. The rib is a bending strength reinforcing part formed of a molding material whose bending strength is stronger than the molding material forming other parts, and the end of the bending strength reinforcing part formed of a molding material having a high bending strength is the outermost end of the pallet. It is disclosed that the position is more retracted toward the inside of the pallet.

  By the way, in the above conventional example, as a molding material having a high bending strength, a material in which talc is added to a synthetic resin is used. When molding with a molding material having a high bending strength, the bending strength is improved, but the impact resistance is poor. There's a problem.

  However, in the above conventional example, since the outermost end molded with a molding material having a high bending strength is not exposed, the outermost end is not damaged by an impact when the tip of the fork hits, When placing an object on the deck, when an impact from above is applied, the part between the beams of the deck is made of a molding material that has high bending strength but low impact strength. There is a problem that this part is easy to be damaged, and in particular, since the dust that has been shaved by impact remains on the top surface of the deck part, the scraped dust adheres to the object placed on the deck part. was there.

  In the prior art disclosed in Patent Document 1, since the deck portion is also formed of the first molding material having high bending strength between the girder portions, the amount of the molding material having high bending strength and high cost is used. Increases the cost, and the weight of the pallet also increases.

Furthermore, in the above-described conventional example, it is disclosed that the end of the bending strength reinforcing portion formed of a molding material having a high bending strength is positioned to be drawn inward from the outermost end of the pallet. When forming the part between the spar parts with a molding material with high bending strength, the spar is placed at a position where the molding material with high bending strength is pulled inward from the outer end of the pallet. There is no disclosure about the specific configuration of the part between the parts.
JP 2007-186244 A

  The present invention has been invented in view of the above-described conventional problems, and reduces the amount of a molding material having a high bending strength to be inexpensive and lightweight, while improving the bending strength of the portion between the girder portions. It is an object of the present invention to provide a synthetic resin pallet capable of suppressing damage to the outer end portion and the deck portion by strengthening the impact to the outer end portion of the pallet and the impact from above on the deck portion. It is.

In order to solve the above problems, a synthetic resin pallet according to the present invention includes a deck portion 1 and a plurality of girders 2, and a synthetic resin pallet 4 having a fork insertion portion 3 between the girders 2. 2, a plurality of connecting ribs 6 that connect between the girder parts 2 are provided between the girder parts 2 and a cross rib 7 that intersects the connecting ribs 6 is provided. At least one or more connecting ribs 6 among the connecting ribs 6 are formed of the first molding material 9 between the beam portions 2 and a part of the cross ribs 7 is formed of the first molding material 9. The end portion on the outer end side of the pallet 4 of the portion formed of the first molding material 9 is located at a position shifted inward from the outer end portion of the pallet 4, so that all of the deck portion 1 of the pallet 4 and other than the deck portion 1 The portion formed by the first molding material 9 is excluded. Portion Yes formed by the second molding material 10, the first mold material 9 is strong molding material flexural strength than the second molding material 10, than the thickness t ₁ of the connecting rib 6, a plurality be made to reduce the wall thickness t ₂ of the outer cross rib 7 of the connecting rib 6 is characterized in.

As described above, at least one of the plurality of connecting ribs 6 is formed of the first molding material 9 having a high bending strength between the beam portions 2. The bending strength between the girder parts 2 can be increased. Moreover, even though the first molding material 9 having a high bending strength is used in order to increase the bending strength of the portion between the beam portions 2 in this manner, the deck portion 1 is excluded from the portions between the beam portions 2. Since a part of the rib 6 and the intersecting rib 7 is formed of the first molding material 9, the amount of the expensive first molding material 9 having high bending strength can be reduced. In addition, the end of the portion formed of the first molding material 9 on the outer end side of the pallet 4 is shifted to the inner side of the outer end of the pallet 4, so that all of the deck portion 1 and the deck portion of the pallet 4 are located. Since the portion other than the portion formed by the first molding material 9 other than 1 is formed by the second molding material 10, the deck portion 1 and the outer end portion of the pallet 4 have a first impact resistance strength low. Therefore, even if an impact is applied to the deck portion 1 from above, the tip of the fork collides with the outer end portion, or the pallet 4 is dragged, the deck material 9 is not present. It is possible to prevent the portion 1 and the outer end portion from being damaged, or being scraped by impact and becoming dust. Further, at least one or more connecting ribs 6 are formed of the first molding material 9 between the beam portions 2, and the end portion on the outer end side of the pallet 4 of the portion formed of the first molding material 9 is When the position is shifted inward from the outer end of the pallet 4, the thickness t ₂ of the intersecting ribs 7 outside the plurality of connecting ribs 6 is made thinner than the thickness t ₁ of the connecting ribs 6. Therefore, when the first molding material 9 is supplied to the connection rib 6, the first molding material 9 is less likely to flow in the cross rib 7 portion outside the plurality of connection ribs 6 than in the connection rib 6 portion. Thus, at least one or more connecting ribs 6 are formed of the first molding material 9 between the beam portions 2 and are formed of the first molding material 9 with a simple configuration of changing the wall thickness. The end on the outer end side of the pallet 4 is the pallet It can be a position displaced inwardly from the outer end of the 4.

  Then, the thickness of the cross rib 7 between the connecting ribs 6 is made thinner than the thickness of the connecting rib 6, and further, the thickness of the cross rib 7 outside the connecting rib 6 is smaller than the thickness of the cross rib 7 between the connecting ribs 6. It is preferable to reduce the wall thickness.

  By adopting such a configuration, at least one or more connecting ribs 6 are formed of the first molding material 9 across the beam portions 2, and the outside of the part of the pallet 4 formed of the first molding material 9. The end on the end side can be set at a position shifted inward from the outer end of the pallet 4.

  Further, the pallet 4 made of synthetic resin according to the present invention includes a deck portion 1 and a plurality of girders 2, and the pallet portion 2 in the synthetic resin pallet 4 having a fork insertion portion 3 between the girders 2. A plurality of connecting ribs 6 that connect between the girder parts 2 are provided, and a cross rib 7 that intersects with the connecting ribs 6 is provided. At least one or more connecting ribs 6 are formed of the first molding material 9 between the beam portions 2 and a part of the cross ribs 7 is formed of the first molding material 9. 9, the end of the pallet 4 on the outer end side is shifted to the inside of the outer end of the pallet 4, so that the deck part 1 of the pallet 4 and the first part other than the deck part 1 are the first. The portion excluding the portion formed by the molding material 9 is the second molding material. 10, the first molding material 9 is a molding material having a bending strength stronger than that of the second molding material 10, and the cross rib 7 formed of the first molding material 9 and the molding material The thickness of the connecting ribs 6 formed in (1) is the same or thicker, and the intersecting ribs 7 between the connecting ribs 6 and the intersecting ribs 7 outside the connecting ribs 6 are non-linear. It is also preferable.

  As described above, at least one of the plurality of connecting ribs 6 is formed of the first molding material 9 having a high bending strength across the beam portions 2, so that the pallet 4 has the weakest bending strength. The bending strength between the girder parts 2 which are parts can be increased. Moreover, even though the first molding material 9 having a high bending strength is used in order to increase the bending strength of the portion between the beam portions 2 in this manner, the deck portion 1 is excluded from the portions between the beam portions 2. Since a part of the rib 6 and the intersecting rib 7 is formed of the first molding material 9, the amount of the first molding material 9 having high bending strength and high bending strength can be reduced. In addition, the end of the portion formed of the first molding material 9 on the outer end side of the pallet 4 is shifted to the inner side of the outer end of the pallet 4, so that all of the deck portion 1 and the deck portion of the pallet 4 are located. Since the portion other than the portion formed by the first molding material 9 other than 1 is formed by the second molding material 10, the deck portion 1 and the outer end portion of the pallet 4 have a first impact resistance strength low. Therefore, even if an impact is applied to the deck portion 1 from above, the tip of the fork collides with the outer end portion, or the pallet 4 is dragged, the deck material 9 is not present. It is possible to prevent the portion 1 and the outer end portion from being damaged, or being scraped by impact and becoming dust. Further, at least one or more connecting ribs 6 are formed of the first molding material 9 between the beam portions 2, and the end portion on the outer end side of the pallet 4 of the portion formed of the first molding material 9 is In setting the position shifted to the inside from the outer end of the pallet 4, the thickness of the cross rib 7 formed of the first molding material 9 and the connecting rib 6 formed of the molding material is the same or thicker, Further, since the cross rib 7 between the connecting ribs 6 and the cross rib 7 outside the connecting rib 6 are non-linear, the outer end side of the pallet 4 passes through the cross rib 7 outside the connecting rib 6. The first molding material 9 has a structure in which it is difficult for the first molding material 9 to flow, and thereby, a simple configuration in which the intersecting rib 7 between the connecting ribs 6 and the intersecting rib 7 outside the connecting rib 6 are non-aligned, At least one or more connecting ribs 6 are passed between the spar 2 And the end of the portion formed of the first molding material 9 on the outer end side of the pallet 4 is shifted to the inside of the outer end of the pallet 4. be able to.

  Then, the route through which the first molding material 9 farthest from the gate trace 12 of the gate for supplying the first molding material 9 to the girder part 2 via the connecting rib 6 flows, from the gate trace 12 to the outer periphery of the pallet 4. It is preferable to make it shorter than the route through which the first molding material 9 closest to the end flows.

  By adopting such a configuration, at least one or more connecting ribs 6 are formed of the first molding material 9 across the beam portions 2, and the outside of the part of the pallet 4 formed of the first molding material 9. The end on the end side can be set at a position shifted inward from the outer end of the pallet 4.

  Further, the pallet 4 made of synthetic resin according to the present invention includes a deck portion 1 and a plurality of girders 2, and the pallet portion 2 in the synthetic resin pallet 4 having a fork insertion portion 3 between the girders 2. A plurality of connecting ribs 6 that connect between the girder parts 2 are provided, and a cross rib 7 that intersects with the connecting ribs 6 is provided. At least one or more connecting ribs 6 are formed of the first molding material 9 between the beam portions 2, and a part of the cross rib 7 is formed of the first molding material 9. 1 and a portion other than the portion formed by the first molding material 9 other than the deck portion 1 are formed by the second molding material 10, and the first molding material 9 is the second molding material. This is a molding material with a bending strength stronger than 10, and the cross rib 7 It is also preferred that the ends of the outer end side of the pallet 4 is characterized in that not connected to the outer end portion of the pallet 4.

  As described above, at least one of the plurality of connecting ribs 6 is formed of the first molding material 9 having a high bending strength across the beam portions 2, so that the pallet 4 has the weakest bending strength. The bending strength between the girder parts 2 which are parts can be increased. Moreover, even though the first molding material 9 having a high bending strength is used in order to increase the bending strength of the portion between the beam portions 2 in this manner, the deck portion 1 is excluded from the portions between the beam portions 2. Since a part of the rib 6 and the intersecting rib 7 is formed of the first molding material 9, the amount of the first molding material 9 having high bending strength and high bending strength can be reduced. In addition, the end of the portion formed of the first molding material 9 on the outer end side of the pallet 4 is shifted to the inner side of the outer end of the pallet 4, so that all of the deck portion 1 and the deck portion of the pallet 4 are located. Since the portion other than the portion formed by the first molding material 9 other than 1 is formed by the second molding material 10, the deck portion 1 and the outer end portion of the pallet 4 have a first impact resistance strength low. Therefore, even if an impact is applied to the deck portion 1 from above, the tip of the fork collides with the outer end portion, or the pallet 4 is dragged, the deck material 9 is not present. It is possible to prevent the portion 1 and the outer end portion from being damaged, or being scraped by impact and becoming dust. Further, at least one or more connecting ribs 6 are formed of the first molding material 9 between the beam portions 2, and the end portion on the outer end side of the pallet 4 of the portion formed of the first molding material 9 is In setting the position shifted to the inside from the outer end of the pallet 4, the end of the cross rib 7 on the outer end side of the pallet 4 is not connected to the outer end of the pallet 4. The end portion on the outer end side of the pallet 4 in the portion formed of the molding material 9 can be set to a position shifted inward from the outer end portion of the pallet 4.

  In the present invention, as described above, the one or more connecting ribs are formed of the first molding material having a high bending strength between the girder portions, so that the bending strength between the girder portions can be increased. Moreover, since the deck portion is not molded with the first molding material in the portion between the girder portions, it is possible to provide an inexpensive and lightweight pallet by reducing the amount of molding material with high bending strength, and Since the deck portion and the outer end portion of the pallet are formed of the second molding material instead of the first molding material, the impact from above on the deck portion, the collision of the tip of the fork to the outer end portion, The deck and outer edge are not easily damaged by pallet drag, etc., and the work environment is deteriorated by scraping due to impact, and the work environment is deteriorated. Can be prevented.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  The pallet 4 made of synthetic resin is provided with a deck portion 1 for placing a placement object and a plurality of girders 2, and a fork insertion portion 3 is formed between the girders 2.

  As the pallet 4 made of synthetic resin, the upper half 4a and the lower half 4a are separately formed by separately molding the pallet 4 of an integral molding die that is molded by synthetic resin integral molding, the upper half 4a, and the lower half 4b. It can be broadly divided into a welding type pallet 4 which is formed by welding and integrating the half body 4b. Furthermore, in both types of the integrally forming pallet 4 and the welding type pallet 4, only the upper surface portion carries the object. A single-sided use type in which an opening is formed on the bottom surface, and the top and bottom surfaces are both decks, and both sides can be used as a deck by flipping up and down. There are types, but the present invention is not limited to any of these types.

  Hereinafter, in the embodiment shown in the accompanying drawings, an example of a double-sided use type (that is, an example in which the upper and lower sides are the deck portion 1) is shown and described in the welding type pallet 4.

  As shown in FIG. 1 and FIG. 2, the upper half 4a integrally formed of synthetic resin has a deck portion 1 (1a) on the upper surface, and a plurality of cylindrical upper beams 2a are integrally formed on the lower surface of the deck portion 1a. The lower half 4b formed integrally with the synthetic resin and integrally formed with a synthetic resin has a lower surface serving as a deck portion 1 (1b), and a plurality of cylindrical lower girders 2b formed on the upper surface of the deck portion 1b. The upper girder part is formed by projecting integrally toward the upper part of the upper half 4a by thermally welding the lower end part of the upper girder part 2a of the upper half part 4a and the upper end part of the lower girder part 2b of the lower half part 4b. The pallet 4 is constituted by integrating the girder part 2 with 2a and the lower girder part 2b.

  The upper half 4a and the lower half 4b may have the same shape and are molded with the same molding die, or have different shapes and are molded with different molding dies. May be.

  In the following description, both the deck portion 1a and the deck portion 1b are simply expressed as the deck portion 1, and the upper girder portion 2a and the lower girder portion 2b are both expressed simply as the digit portion 2.

  Between the beam portions 2 on the back surface of the deck portion 1 of the upper half body 4a or the lower half body 4b, a fork insertion guide inclined portion 20 is provided at a portion serving as an inlet side end portion of the fork insertion portion 3, and the beam portion A plurality of connecting ribs 6 are formed in the other portion between the two in the fork insertion direction, and a plurality of intersecting ribs 7 intersecting the plurality of connecting ribs 6 are formed.

  The girder part 2 has a cylindrical shape, and a plurality of girder part inner ribs 8 are formed on the inner surface of the peripheral wall part 5 of the girder part 2, and the plurality of girder part inner ribs 8 correspond to the plurality of connecting ribs 6. The inner ribs 8 corresponding to the connecting portions 5a of the peripheral wall 5 with the connecting ribs 6 are connected in a straight line, or are connected with a slight shift in the fork insertion direction.

  In each of the embodiments shown in FIGS. 1 to 10, the deck portion 1 is constituted by a face plate portion 1c, and a cylindrical girder portion 2 projects from the back surface of the face plate portion 1c. A plurality of connecting ribs 6 and intersecting ribs 7 intersecting with the connecting ribs 6 project between the girders 2 on the back surface of the portion 1c. It is integrated.

  Further, a fork insertion guide inclined portion 20 is provided between the entrance side end portions of the beam portion 2 at the entrance side end portion of the fork insertion portion 3.

  The inclined portion 20 for fork insertion guide is an inner rib formed between the outer end rib 20a constituting the outer end portion of the pallet 4 and the parallel and adjacent beam portions 2 at a position shifted to the back side of the outer end rib 20a. 20b and the inclined rib 20c which connects between the outer end rib 20a and the inner rib 20b. The inner rib 20b has the same protruding length as the connecting rib 6 or a slightly shorter protruding length, the outer end rib 20a has a shorter protruding length than the inner rib 20b, and the inclined rib 20c has an end surface in the protruding direction. However, the side that is connected and integrated with the outer end rib 20a has a short projecting length and is inclined so that the projecting length becomes longer toward the inner rib 20b side.

  The cross rib 7 is surrounded not only between the adjacent girder parts 2 but also by the four girder parts 2 (the girder part 2 located at the corner, the girder part 2 located at the center, and the girder part 2 located between the two sides). Further, the end portion of the cross rib 7 is integrally connected to the inner rib 20b.

  The cross rib 7 is surrounded not only between the adjacent girder parts 2 but also by the four girder parts 2 (the girder part 2 located at the corner, the girder part 2 located at the center, and the girder part 2 located between the two sides). The end of the cross rib 7a is connected and integrated with the inner rib 20b of the fork insertion guide inclined portion 20.

  In the present invention, at least one or more of the plurality of connecting ribs 6 is formed of the first molding material 9 across the beam portions 2 except for the deck portion 1 in the portion between the beam portions 2. In addition, a part of the cross rib 7 is formed of the first molding material 9.

  The end of the portion formed of the first molding material 9 on the outer end side of the pallet 4 is shifted to the inside from the outer end of the pallet 4.

  A portion of the pallet 4 excluding the entire deck portion 1 and a portion formed of the first molding material 9 other than the deck portion 1 is formed of the second molding material 10.

  In addition, in the following FIG. 3 thru | or FIG. 11, the part formed with the 1st molding material 9 is represented by pointillism.

  The first molding material 9 is a molding material having a bending strength stronger than that of the second molding material 10. For example, normal polypropylene is used as the second molding material 9, and as the first molding material 9, physical property polypropylene having higher bending strength than the above-mentioned normal polypropylene, or talc is added to normal polypropylene. Molded using a molding material. In addition, a virgin material is used as the first molding material 9, but the second molding material 10 may be either virgin or a recycled material.

  The first molding material 9, which is a molding material having a high bending strength, is expensive and poor in fluidity due to the addition of talc. However, the present invention has at least one of the plurality of connecting ribs 6 as described above. The connecting ribs 6 are formed of the first molding material 9 between the beam portions 2, and the peripheral wall portions 5 of the two or more connecting ribs 6 are formed of the first molding material 9 between the beam portions 2. Each of the connecting portions and a part of the girder inner rib 8 adjacent to the connecting portion are formed of the first molding material 9, and a part of the cross rib 7 is formed of the first molding material 9. Thus, since the site | part shape | molded by the 1st molding material 9 in the pallet 4 is partial, the usage-amount of the 1st molding material 9 can be decreased, it suppresses that cost becomes high, and A decrease in moldability can also be prevented. Moreover, in the present invention, as shown in FIG. 5, since the entire deck portion 1 is formed of the second molding material 10, the usage amount of the first molding material 9 can be further reduced.

  In addition, although the weight increases by adding talc, it is not so heavy because it is used only in a small amount. In addition, since at least one of the plurality of connecting ribs 6 is formed of the first molding material 9 between the beam portions 2, when handling the pallet 4 in an automatic warehouse, the bending strength is maximized. Since the necessary part is a part that connects between the girder parts 2, the connection rib 6 provided in this part is reinforced intensively, so that the usage fee of the molding material having high bending strength as a whole is reduced and high. A pallet 4 having bending strength can be provided.

  In order to increase the bending strength of the pallet 4 as described above, in forming at least one of the plurality of connecting ribs 6 with the first molding material 9 between the beam portions 2, the deck portion is formed. One part is not formed with the first molding material 9 but is formed with the second molding material 10, and a part of the cross rib 7 is formed with the first molding material 9. 9 so that the end on the outer end side of the pallet 4 of the portion formed in 9 is positioned inwardly from the outer end of the pallet 4 so that the deck portion 1 of the pallet 4 and the outer end of the pallet 4 are It is characterized by being formed of the second molding material 10.

  Thus, the end of the portion formed of the first molding material 9 on the outer end portion side of the pallet 4 is shifted to the inner side of the outer end portion of the pallet 4, and all of the deck portion 1 of the pallet 4 and Since the portion excluding the portion formed by the first molding material 9 other than the deck portion 1 is formed by the second molding material 10, the deck portion 1 and the outer end portion of the pallet 4 have impact resistance strength. The weak first molding material 9 does not exist, and as a result, while the bending strength between the girder parts 2 is increased, an impact is applied to the deck part 1 from above, or the tip of the fork collides with the outer end part. Even if the pallet 4 is dragged, it is possible to prevent the deck portion 1 and the outer end portion from being damaged or being scraped off by impact and becoming dust.

  Here, when the first molding material 9 is supplied from the gate and at least one of the plurality of coupling ribs 6 is formed by the first molding material 9 across the spar 2, the crossing is performed. The rib 7 is also supplied with the first molding material 9 and partially molded with the first molding material 9. In this case, the first molding material 9 does not reach the outer end of the pallet 4. It has become. In addition, as long as the 1st molding material 9 does not reach the outer end part of the pallet 4, all the some connection ribs 6 may be formed with the 1st molding material 9 between the beam parts 2. FIG. . Further, when the connecting rib 6 between the beam portions 2 is formed of the first molding material 9, a part of the peripheral wall portion 5 to which the connecting rib 6 is connected and a part of the inner rib 8 of the beam portion are integrated with the connecting rib 6. Alternatively, the first molding material 9 may be used.

3 and 4, at least one of the plurality of connecting ribs 6 is formed of the first molding material 9 across the beam portions 2, and the first molding material 9 is formed on the pallet 4. One embodiment of a configuration for preventing the outer rib from reaching the outer end is shown, and the thickness t ₂ of the cross ribs 7 outside the plurality of connecting ribs 6 is made thinner than the thickness t ₁ of the connecting ribs 6. It is. Thereby, it becomes the structure which worsens the flow of the 1st molding material 9 in the cross | intersection rib 7 of the outer side of the some connection rib 6 by simple structure of changing thickness, as shown in FIG. 3, FIG. In addition, at least one or more connecting ribs 6 are formed of the first molding material 9 between the beam portions 2, and the end portion on the outer end side of the pallet 4 of the portion formed of the first molding material 9 is the pallet. It can be set as the position which shifted | deviated to the inner side rather than the outer side edge part.

  In order to facilitate the flow of the first molding material 9 to two or more connecting ribs 6, the intersecting ribs 7 between the connecting ribs 6 may be thicker than the connecting ribs 6. The gate of the first molding material 9 at this time is preferably provided on the intersecting rib 6 in consideration of the balance of the first molding material 9, but may be on the connecting rib 6.

In this case, the thickness t ₃ of the intersecting rib 7 between the connecting ribs 6 is made thinner than the thickness t _{1 of} the connecting rib 6, and further, the thickness t ₃ of the intersecting rib 7 between the connecting ribs 6 is connected. When the wall thickness t ₂ of the outer cross rib 7 than the rib 6, more reliably at least one or more connecting ribs 6 formed by the first molding material 9 over between the girder 2, and a first mold The end of the portion formed of the material 9 on the outer end side of the pallet 4 can be set to a position shifted inward from the outer end of the pallet 4.

  FIG. 6 shows another embodiment, in which the cross ribs 7 formed of the first molding material 9 and the connecting ribs 6 formed of the molding material have the same or thicker wall thickness. This is an example in which the intersecting ribs 7 between the connecting ribs 6 and the intersecting ribs 7 outside the connecting ribs 6 are non-linear. As described above, when the intersecting rib 7 between the connecting ribs 6 and the intersecting rib 7 outside the connecting rib 6 are non-linear, the first molding material 9 is formed on the intersecting rib 7 and the intersecting rib 7 outside the connecting rib 6. Thus, it is ensured that at least one or more connecting ribs 6 are formed of the first molding material 9 between the beam portions 2 and the portion of the pallet 4 formed of the first molding material 9 is surely formed. The end on the outer end side can be set to a position shifted inward from the outer end of the pallet 4.

  In this case, a route through which the first molding material 9 farthest from the gate trace 12 of the gate for supplying the first molding material 9 to the girder 2 via the connecting rib 6 flows is connected to the pallet 4 from the gate trace 12. By making it shorter than the route through which the first molding material 9 closest to the outer peripheral end flows, at least one connecting rib 6 is more reliably formed by the first molding material 9 between the beam portions 2. And the edge part by the side of the outer edge part of the pallet 4 of the part formed with the 1st molding material 9 can be made into the position which shifted | deviated to the inner side rather than the outer edge part of the pallet 4. FIG.

  7 and 8 show another embodiment. In this embodiment, the fork in which the end of the cross rib 7 on the outer end side of the pallet 4 is provided at the outer end of the pallet 4 is shown. It is the structure which is not connected with the inner side rib 20b of the inclination part 20 for insertion guides. That is, one end of the intersecting rib 7 extends to the connecting rib 6 positioned on the outer end side of the pallet 4 and does not extend any further, and the connecting rib 6 positioned on the outer end side of the pallet 4 and the fork insertion guide slope. A gap 29 without the cross rib 7 is formed between the inner rib 20 b of the portion 20. Therefore, when the first molding material 9 is supplied and the entire length of at least one or more connecting ribs 6 is formed of the first molding material 9, the first molding material 9 is formed on the outer end side of the pallet 4 through the cross rib 7 portion. The molding material 9 does not flow, and the first molding material 9 can be prevented from being exposed at the outer end portion of the pallet 4.

  Further, it is clear that the strength is further improved by forming a plurality of connecting ribs 6. Further, when two or more connecting ribs 6 are formed, particularly three or more, in order to efficiently fill the first molding material 9 at the distal end portion of the spar 2, a substantially central position between the plurality of connecting ribs 6 is obtained. Then, a gate of the first molding material 9 is formed. That is, if the filling balance of the first molding material 9 is poor, the first molding material 9 does not flow easily at the distal end portion of the peripheral wall portion 5 of the girder 2, and a space not filled with the first molding material 9 is formed. Even if the upper half 4a and the lower half 4b are welded, a gap is formed and water enters. Further, if the first molding material 9 is to be filled so that there is no gap, the pallet 4 becomes expensive and heavy due to filling more than necessary.

  Further, the connecting rib 6 that becomes the center of the plurality of connecting ribs 6 is made thicker than the other connecting ribs 6, and the first molding material 9 is quickly filled in the girders 2, and the filled first molding material is filled. Since 9 spreads like a ripple in the shape of a mountain, a weld line may not easily occur.

  Next, an example in which the pallet 4 of the present invention (in the embodiment, the upper half 4a and the lower half 4b) is molded using the first molding material 9 and the second molding material 10 will be described.

  For example, when the upper half 4a (or lower half 4b) of the pallet 4 is molded with a molding die, as shown in FIG. 9A, the molding die includes a fixed die 90, a movable die 91, and an internal movement. The inner moving mold 92 is protruded into the cavity 60 formed by the fixed mold 90 and the movable mold 91, and the inner moving mold 92 protrudes into the deck. A part of the part forming cavity 80 is blocked. In this state, the first molding material 9 is supplied from the gate for supplying the first molding material 9, and the connecting rib forming cavity portion 71, followed by a part of the peripheral wall forming cavity portion 72, followed by this. Thus, the first molding material 9 is supplied to a part of the cavity portion 73 for forming the ribs in the spar portion. The first molding material 9 is supplied so as to be filled over the entire length of at least one of the connecting rib forming cavities 71 among the plurality of connecting rib forming cavities 71. The first molding material 9 is also supplied to a part of the cavity portion. As described above, at least one or more of the first molding material 9 has a structure in which the first molding material 9 hardly flows to the outer end portion of the cavity 60. Since the first molding material 9 does not reach the outer end portion of the cavity 60 at the time when the first molding material 9 is supplied so as to be filled over the entire length of the connecting rib forming cavity portion 71, at least this In a state where the first molding material 9 is filled over the entire length of the one or more connecting rib forming cavities 71 and the first molding material 9 does not reach the outer end of the cavity 60, To stop the supply of the first molding material 9.

  Next, as shown in FIG. 9B, the internal moving die 92 is retracted, and the second molding material 10 is supplied to the remaining part of the cavity 60 except for the part where the first molding material 9 is supplied. Supplies and fills the second molding material 10 from another gate.

  The first molding material 9 supplied earlier and the second molding material 10 supplied later are merged and integrated at the boundary portion 50 to form the upper half 4a (or the lower half 4b). Mold.

  In the said embodiment, the deck part 1 is comprised by the faceplate part 1c, the cylindrical girder part 2 is protrudingly provided in the back surface of this faceplate part 1c, and also the back surface of the faceplate part 1c is provided between the girder parts 2. Although the example which protruded the some connecting rib 6 and the cross rib 7 which cross | intersects the connecting rib 6 was shown, the one part or all part of the deck part 1 may be formed with the rib 1d. As shown in FIG. 10, between the girders 2, the portion on the front side of the rib 1 d constitutes the deck portion 1, and the portion on the back side constitutes the connecting rib 6 and the intersecting rib 7. And the part used as the deck part 1 of the surface side of the rib 1d is formed with the 2nd molding material 10, and at least 1 or more is connected to the 1st molding material 9 over the full length between the girder parts 2 among several connecting ribs 6. FIG. And a part of the cross rib 7 is formed by the first molding material 9.

  In forming the pallet 4, the gate position for supplying the first molding material 9 to be supplied first (the position of the gate mark after molding) has a plurality of connecting ribs 6 between the beam portions 2. Although it is preferable to provide it at the substantially central part of the area (especially at the intermediate part between the beam parts 2 of the connecting rib 6 in the intermediate part), the present invention is not limited to this, and a gate may be provided at the beam part 2 part. Good.

It is a perspective view of the upper half (or lower half) in the pallet of the present invention. It is a perspective view of a pallet same as the above. It is a principal part expansion perspective view same as the above. It is a principal part top view same as the above. (A) is sectional drawing same as the above, (b) is the principal part expanded sectional view same as the above. It is a principal part top view of the upper half body (or lower half body) in other embodiment of this invention. It is a principal part perspective view of other embodiment same as the above. It is a principal part top view same as the above. (A) is sectional drawing for description which shows the state which supplied the 1st molding material to the cavity of a shaping die, (b) is a 2nd molding material after supplying a 1st molding material. It is sectional drawing for description which shows the supplied state. It is sectional drawing of the example which showed other embodiment of this invention and formed the deck part with the rib.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Deck part 2 Girder part 3 Fork insertion part 4 Pallet 6 Connecting rib 7 Crossing rib 9 1st molding material 10 2nd molding material 12 Gate trace

Claims (5)

  A synthetic resin pallet with a deck part and a plurality of girders, and between the girders is a fork insertion part, and is provided with a plurality of connecting ribs that connect the girders between the girders and intersects with the connecting ribs Cross ribs are provided, and at least one of the plurality of connecting ribs except for the deck portion among the portions between the spar portions is formed of the first molding material between the spar portions, and A part of the pallet is formed of the first molding material, the end of the pallet on the outer end side of the pallet is shifted to the inside of the outer end of the pallet, and the pallet All of the deck portion and a portion other than the portion formed of the first molding material other than the deck portion are formed of the second molding material, and the first molding material is bent more than the second molding material. Strong molding material Than the thickness of the connection rib, synthetic resin pallet, characterized in that formed by reducing the thickness of the cross rib of the outer plurality of connection ribs.   The thickness of the intersecting rib between the connecting ribs is made thinner than the thickness of the connecting rib, and further, the thickness of the intersecting rib outside the connecting rib is made thinner than the thickness of the intersecting rib between the connecting ribs. The pallet made from synthetic resin of Claim 1 characterized by the above-mentioned.   A synthetic resin pallet with a deck part and a plurality of girders, and between the girders is a fork insertion part, and is provided with a plurality of connecting ribs that connect the girders between the girders and intersects with the connecting ribs Cross ribs are provided, and at least one of the plurality of connecting ribs except for the deck portion among the portions between the spar portions is formed of the first molding material between the spar portions, and A part of the pallet is formed of the first molding material, the end of the pallet on the outer end side of the pallet is shifted to the inside of the outer end of the pallet, and the pallet All of the deck portion and a portion other than the portion formed of the first molding material other than the deck portion are formed of the second molding material, and the first molding material is bent more than the second molding material. Strong molding material The cross ribs formed of the first molding material and the connecting ribs formed of the molding material are made the same or thicker, and the cross ribs between the connecting ribs and the cross ribs outside the connecting ribs are not A synthetic resin pallet characterized by being in a straight line.   The flow of the first molding material farthest from the gate trace of the gate for supplying the first molding material to the spar through the connecting rib is the first first closest to the outer peripheral edge of the pallet. 4. The synthetic resin pallet according to claim 3, wherein the pallet is made shorter than a route through which the molding material flows.   A synthetic resin pallet with a deck part and a plurality of girders, and between the girders is a fork insertion part, and is provided with a plurality of connecting ribs that connect the girders between the girders and intersects with the connecting ribs Cross ribs are provided, and at least one of the plurality of connecting ribs except for the deck portion among the portions between the spar portions is formed of the first molding material between the spar portions, and A part is formed from the first molding material, and the entire deck part of the pallet and a part other than the part formed from the first molding material other than the deck part are formed from the second molding material. The first molding material is a molding material having a bending strength stronger than that of the second molding material, and the end of the cross rib on the outer end side of the pallet is not connected to the outer end of the pallet. Synthetic resin pallet Door.